import tkinter
import time
import random
class Ball():
    def __init__(self,canvas,color):
        self.canvas=canvas
        self.id =canvas.create_oval(0,0,15,15,fill=color)
        level=[-9,-7,-5,-3,-1,0,1,3,5,7,9]

        canvas.move(self.id,254,100)
        self.x=random.choice(level)
        self.y=random.choice(level)
    def draw(self):
        canvas.move(self.id,self.x,self.y)
        pos = canvas.coords(self.id)
        if pos[3]>=600:
            self.y=-3
        if pos[1]<=0:
            self.y=3
        if pos[2]>=600:
            self.x= -3
        if pos[0] <=0:
            self.x = 3

class Paddle():
    def __init__(self,canvas,color):
        self.canvas=canvas
        self.id =canvas.create_rectangle(0,0,300,20,fill=color)
        canvas.move(self.id, 145, 400)
        self.x=-3
        self.y=0
        self.canvas.bind_all('<KeyPress-Left>',self.turn_left)
    def turn_left(self,evt):
      self.x=-3
      self.canvas.bind_all('<KeyPress-Right>',self.turn_right)
    def turn_right(self, evt):
          self.x=3
    def draw(self):
        canvas.move(self.id,self.x,self.y)
        pos = canvas.coords(self.id)
        if pos[3]>=600:
            self.y=-3
        if pos[1]<=0:
            self.y=3
        if pos[2]>=600:
            self.x= -3
        if pos[0] <=0:
            self.x = 3
class Score():
    def __init__(self,canvas,color):
        self.canvas = canvas
        self.score=0
        self.id = canvas.create_text(450, 10, text=self.score, font=("Arial",20), fill=color)

tk=tkinter.Tk()
tk.title("弹球")
tk.resizable(0,0)
tk.wm_attributes('-topmost',1)
canvas=tkinter.Canvas(tk,width=600,height=600)
canvas.pack()
tk.update()


paddle = Paddle(canvas,"blue")
ball = Ball(canvas,"red")
ball2 = Ball(canvas,"blue")
score = Score(canvas,"red")
while 1:
    paddle.draw()
    ball.draw()
    ball2.draw()
    tk.update_idletasks()
    tk.update()
    time.sleep(0.01)
